armrests in Vandura 3500 - solution
After several body- and trimshop mechanics could not remove the armrests, I opened the backrest. There are only two parts involved: backrest and armrest. No springs, sleeves, or any other moving parts.
The procedure to remove the armrest is:
1; push armrest into bacrest
2; rotate armrest downward, pointing to the floor
3; pull the armrest out.
High friction of rusted surfaces prevented to feel proper alignment of a pin (protruding from the shaft of the armrest) with a notch ( keyhole-like opening in the frame).
Thank you, driftwood, for your time and effort. seventyn